Dobby used in looms for weaving.



P. BARLOW. DOBBY USED IN LOOMS FOR WEAVING.

APPLICATION FILED JAN-20,1917- 1 ,256,6%% Patented Feb. 19, 1918.

2 SHEETSSHEET 1.

P. BARLOW. 'DOBBY USED IN LOQMS FOR WEAVING. APPLICATION FILED JAN-20.1917- Lgfififiqh Patented Feb.19,1918.

2 SHEETS-SHEET 2.

PETER BARLOW, 0F PRESTIVICH, NEAR MANCHESTER, ENGLAND.

DOBBY USED IN LOOMS FOB. WEAVING.

Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed January 20, 1917. Serial No. 143,455.

T 0 all whom it may concern:

ject of the King of Great Britain. residing at the Annexe, Clifton Road, Prestwich, near Manchester, in the county of. Lancaster, England, have invented new and useful Improvements in Dobbies Used in Looms for Weaving, of which the following is a specification.

My invention relates to improvements in (lobbies used in looms for weaving and has for its object to construct a (lobby which is not only positive in action but which is also adapted for adjustment to prevent loss of pattern when a weft is or wefts are found to have been broken during the weaving of the fabric and which further will relieve the pegs of the weight of the levers and connections during the working of the dobby. In other words, the loom of the present invention is positively geared so that in the event of the wefts becoming broken, the loom thereafter continuing to run for a few picks, and it therefore becoming necessary to turn back in order to piece the broken weft and rectify the defect, there will be no loss of position or inaccurate registration, as all the parts will move in unison when set back and will come forward again in true related working position when weaving is recommcnccd.

In the accompanying two sheets of drawings- Figure 1 is an elevation of my improved dobby mechanism with one of the side plates removed to show the relative positions 0 the eccentric, its strap and the double ended lever which I employ for each jack lever.

Fig. 2 is a plan of the same with the side plate in position and showing two jack levers only, the others being omitted.

Fig. 3 is an elevation of the other side of the motion showing an eccentric bowl on the first motion shaft with rack and pinion gearing for driving the second motion shaft.

Fig. 4 is a diagrammatic view of the ring wheel which drives the lag barrel with the cam wheel, its bowl and lever mounted on the first motion shaft.

In carrying my invention into effect I cmploy the usual side plates or framing l of the dobby, between or on which are mounted the first motion shaft 2, ring wheel 3. star wheel 30, lag barrel 4:, rack 5 and pinion 5 second motion shaft (3, and jacks or lifting levers 7.

The first motion shaft 2 is driven as usual from the crank or tappet shaft of the loom (not shown) and carries the usual ring wheel 3 which drives the lag barrel 4 through the star wheel 30. To the ring wheel 3 I bolt a hollow cam wheel 8 or equivalent which, through a bowl 9 and lever 9 imparts an oscillating movement to a series of rockers or knives, or a continuous rocker bar or knife 10, carried on a shaft or pivots 10 mounted in bearings in the side plates or framing parallel to the first motion shaft.

In the example illustrated one end of this shaft or pivot 10" is carried through the framing and then passed through one end of a crank arm 10 to which it is secured by a set screw, not shown; the other end of the crank arm 10 is pivotally attached to the lever 9* so that when the lever 9 is moved backward or forward by the cam wheel 8 it imparts, through the crank arm 10 an oscillating movement to the rocker bar 10.

On the opposite side of the dobby at the other end of the first motion shaft 2 I mount a crank, tappet or eccentric, as illustrated an eccentric bowl 2* on a disk 2*, for the purpose of giving a reciprocating motion in the usual way to the rack 5 geared with the pinion 5 keyed on the second motion shaft 6 which has two longitudinal diametrically opposite grooves (i 6 formed thereon. On this second motion shaft 6 I mount loosely as many eccentrics 6 as there are jacks or lifting levers .7 and on each eccentric 6 I form a radial slot 11 in which slides a key 11 forced normally outward by a spiral or other spring 11 to engage one or other of two corresponding recesses 12*, 12 in the eccentric sleeve or strap 12 which is pivoted to its corresponding jack lever 7 at 16.

I employ a double lever 13 in the form approximately of a C or portion of a circle and so mounted that when moved upon its fulcrum 13 one or other of its extremities 13 or 13 will engage and force inward the lower arm 13 of the radial key 11 against the resistance of its spiral spring l1 into engagement with one or other of the longitudinal grooves 6 or 6* in the second motion shaft 6 and so lock the eccentric 6 on the said shaft 6", To a convenient part of this double or C lever 13 I pivot an arm or forked lever 14 the free end of which has notched prongs 14 14 or is otherwise formed to engage either the upper or lower lip or edge of its corresponding rocker or rocker bar or knife 10.

On the lag barrel 4 being actuated by the first motion shaft a peg 4 on the pattern chain 40 on the lag barrel lifts the free end of the forked arm or lever and so brings the notch 14 on its lower prong into engagement with the bottom lip or edge of the rocker bar or knife 10 which, being moved by the cam wheel 8 and connected lever 9 draws out the forked lever thereby depressing the upper end 13 of the C lever and so pressing the radial key 11 out of the top recess in the eccentric sleeve or strap 12 and into one of the longitudinal grooves of the second motion shaft 6. T he'latter shaft 6 then partially rotates the eccentric 6 locked to it by the radial key 11" and, through its connected sleeve or strap 12, draws down the ack or lifting lever When there is'no peg 4 on the chain on the lag barrel 4 the forked lever 14 drops and the notch on its upper prong l4'= engages the upper lip or'edge .of the rocker bar or knife 10 thus pushing (instead of pulling) the C lever and so bringing the C lever into contact with the radial key 11 then in the bottom position and forcing it out ofthe lower notch 12 in the sleeve or strap 12, disengages the eccentric 6 from the sleeve and engages it with the second motion shaft 6 and allows the latter to turn the eccentric back to the first position ready for the next movement.

I am aware that in British Patent No.

13,762 of 1893, it has been proposed previously to employ aforked or double ended hooked lever controlled by the pattern chain or surface to engage one or other blade of a double bladed rocking knife-and raise the indicator lever or allow the same to drop thereby putting the intermediate vibrator gear into mesh with the upper or lower cylinder gear or toothed segment and so through the vibrator lever to actuate the shuttle boxes or healds.

I am further aware that in British Patent No. 3080 of 1881 it has been proposed also to employ an arrangement ofeccentrics one for each jack lever and to mount such eccentrics upon the bosses of an equal number of notched disks secured on a grooved shaft rotated constantly in one direction, and to the full part of each eccentric is jointed a spring ca-tchiever or fingencapable of engaging with one or other of the two notches formed on the circumference of the corresponding disk while the movement of the instead of being rotated constantly'in one direction. F urther although the selective mechanism is actuated from the pattern surface in both cases, in my arrangement this is effected indirectly through the rocker bar and my double ended lever operating the radial key 11 to lock toor release from the oscillating shaft 6, each eccentric as; it is required."

What I claim as my invention and to secure by Letters Patent is 1. An improved dobby motion comprising as its essential features the following desire parts in combination; a first motion shaft;

an oscillating second motion shaft; means for rocking the second motion shaft from the first motion shaft; a plurality of jack case the grooved shaft 6 upon levers; as many eccentrics mounted on the second motion shaft as there are jack levers; a strap surrounding each eccentricand connecting it to its jack lever; each eccentric having a radial slot, and the second motion shaft having a pair of diametrically opposite longitudinal grooves; a key sliding in each radial slot; a spring urging each key toward the outer end ofits radial slot; a lag barrel; and locking means including said keys controlled by the lag barrel to lock a particular eccentric to the second motion shaft when it i required to operate a jack lever connected to that eccentric.

An improved dobby motion comprising as itsessential features the following parts in combination; a first motion shaft; an oscillating second motion shaft; means for rocking the second motion shaft from the first motion shaft; a plurality of jack levers; as many eccentrics mounted on the second motion shaft as there strap surrounding each eccentric and connecting it to it's'jack lever; each eccentric having a radial slot, and the second motion shaft having a pair of diametrically opposite longitudinal grooves; a key sliding in each radial slot; a spring urging each key toward-the outer end'cof its radial slot; a lag barrel; and locking means including to the second inoare jack levers; a

jack lever connected to that eccentric; said locking means comprising a double ended lever with a two pronged extension controlled by the lag barrel, there being also provided a rocker bar operated to lock said lever to and release it from the second motion shaft.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

- PETER BARLOW.

Witnesses:

S. \V. GILLn'r'r, HERBERT ROWLAND ABBEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

